Georgette Douwma / Common reef / Day octopus hunting for crustaceans and fish, enclosing coral head with arms and webs, using the arm tips to flush out prey into waiting suckers {Octopus cyaneus} Andaman Sea, Thailand

Georgette Douwma / Common reef / Day octopus {Octopus cyaneus} at rest on coral reef Sipadan, Malaysia

David Hall / Day octopus (Octopus cyanea) jetting over coral reef. Komodo, Indonesia.

Gary Bell/ Oceanwide / Maori Octopus (Octopus maorum), Mornington Peninsula, Victoria, Australia

Gary Bell/ Oceanwide / Veined Octopus (Octopus marginatus), Anilao, Philippines

Gary Bell/ Oceanwide / Veined Octopus (Octopus marginatus) hiding in ceramic cup using a shell as a door, Anilao, Philippines

Gary Bell/ Oceanwide / Veined Octopus (Octopus marginatus) hiding in shell, Anilao, Philippines

Gary Bell/ Oceanwide / Reef Octopus (Octopus cyanea) pair, Milne bay, Papua New Guinea

Gary Bell/ Oceanwide / Reef Octopus (Octopus cyanea), Milne Bay, Papua New Guinea

Gary Bell/ Oceanwide / Greater Blue-ringed Octopus (Hapalochlaena lunulata), Great Barrier Reef, Australia

Shane Gross / Day octopus (Octopus cyanea) hunting along a pristine coral reef off Alor, Indonesia.

David Fleetham / Divers looking at Day octopus (Octopus cyanea). Hawaii. October 2017. Model released.